Your Second Brain, Chaerok
Drop in text, links, or photos and Chaerok's AI agent summarizes, tags, and connects them into notes you can find again. On-device by default, free to start.
Toss in a thought, a link, or a photo. Chaerok summarizes it, tags it, and connects it to what you've saved — then brings it back in your morning briefing. On-device by default, so your notes never leave your phone.
Chaerok (採錄): To search for and gather necessary words or writings. Turn your scattered thoughts into wisdom.
Intelligent workflows powered by AI
Focus on the act of recording itself, while Chaerok's intelligent engine automates the rest.
Rapid Capture
Capture any moment instantly. Just drop in text, links, or images and Chaerok keeps them safe.
Intelligent Summary
Find the core within vast information. The AI agent transforms complex notes into intuitive briefings.
Semantic Connection
Different thoughts meet to create new insights. The ontology-based graph UI visualizes the links between your ideas.
Mapping Your Knowledge: Semantic Ontology
Chaerok manages records not as a linear list, but as an organic web. As your thoughts grow, the knowledge graph becomes denser, suggesting new ideas you hadn't discovered before.
- Automatic Node Connection Algorithm
- Context-Based Knowledge Clustering
- Visualization of Idea Convergence
Capture any page right where you are
When you come across something worth keeping, save it without copying links around. Chaerok summarizes it and files it with tags.
One click to save
Toolbar icon, right-click menu, or the Alt+Shift+C shortcut — whichever you reach for.
Save just the part you picked
Select a passage first and only that gets saved. Select nothing and it finds the article body.
Lands with everything else
Pages saved here stack up alongside what you save on your phone. With Chaerok Pro they open on any device.
Only pay for what you need
Recording, organizing, and searching all run on your device for free, no account required. Turn on Pro only when you need deeper understanding.
Chaerok — $0 (free forever)
Every core feature, running on your device
- Unlimited text, URL, and image capture
- Automatic tagging and folder sorting
- On-device summaries
- Rule-based briefings
- Local semantic search
Chaerok Pro — ₩4,900 / month
Understand long articles in full, and pick up on any device
- Everything in the Free plan
- Long-context understanding for full articles
- Understanding of content inside images
- AI memory linking — surfaces related notes automatically
- Cloud sync and backup
- Continue on any device
- Web App & Chrome Extension support
* Prices shown may vary by store and are subject to change.
Today's insights become tomorrow's wisdom.
Because it holds your most intimate thoughts, we designed it with privacy as our top priority.
On-Device AI
Data summarization and analysis are processed safely on your device, not the cloud.
Pick Up on Any Device
Turn on cloud sync with Chaerok Pro and the same notes follow you across phone, tablet, and web.
On Your Device First
Notes are saved on your device first. You decide whether anything goes to the cloud, and data is encrypted in transit and at rest.
Frequently Asked Questions
Can I use it for free?
The core — capturing, organizing, and searching — is free forever and runs on your device without an account. Long-context understanding, reading images, and syncing across devices come with Chaerok Pro.
Is my data kept safe?
Your notes are stored on your device first. Sign in and turn on Chaerok Pro's cloud sync to back them up automatically and continue on other devices. However, bulk export features like Markdown or CSV formats are planned to be supported gradually.
Do you support languages other than Korean?
Currently, we fully support semantic analysis for Korean and English records, and we plan to gradually expand supported languages.